I make a few crosses from time to time, they can be fun and can produce well. However they can also bring forward undesired traits as well.
The seed made on the hermie its self can pick up more bad traits,,,
When I make seed the pollen producing plant/s involved have their own area, closed with no circulation to the others (females).
When I last harvested pollen it (the whole flowering top) went into a Ziploc baggie. I put a female bud to be impregnated into the baggie, sealed as best one can and shake! Wait 6-8 weeks and harvest the seed, I got 1.5 stray seed on a plant I did not want seed from (made a great plant BTW). I also get a few runts which are pulled,,, I get very few hermies from the seed (I myself have 0, but there have been reports of them from others)